Production of heavy paper



F. H FULLER. PRODUCTION OF HEAVY PAPER, &c.

APPLICATION FILED JUNE3I I918.

Patented Sept. 9, 1919.

UNITED STATES PATENT- OFFICE.

FRED H. FULLER, OF WATERTO'WN, NEW YORK.

PRODUCTION OF HEAVY PAPER, &o.

Specification of Letters Patent.

Patented Sept. 9, 1919.

Application filed June 8, 1918. Serial No. 237,931.

To all whom it may concern:

Be it known that I, FRED H. FULLER, a citizen of the United States,residing at Watertown, in the county of J eflerson and paper.

Its object is to provide for greater efli-.

ciency and economy of manufacture and especially to enable the readyproduction and handling of thick sheets, such as box board or heavypaper, and'to rapidly and successfully manufacture cellucotton made frombleached sulfite pulp as a substitute for the ordinary cotton commonlyused in hospi tals etc. To do this efl'ectively I provide a methodciently a thick but porous sheet.

. To these ends my invention comprises the method set forth in theappended claims and the parts and combinations of parts there recited.

In the drawings Figure 1 is aside eleva-1 tion partly in section Fig. 2is aplan View; In these drawings I have illustrated a combinedFourdrinier and cylinder machine. The arrangement of the parts enablesme to run a sheet of any desired thickness.

In these drawings 10 represents a flow box and 11a head box having a lip12 extending to the top of a cylinder mold 13, which I. employ insteadof the customary solid iron breast roll. 14 is'the makingwire orwire-cloth which passes around the cylinder mold and, on the upper run,over the table rolls 15, and on the lower run over suitable guiding andtension rollers 16 making its outer or final turn about a blowing roll17 18 represents deckle straps running over pulleys 19 and 20 andarranged above the making-wire in the customary manner. 21 representscustomary suction boxes arranged beneath the makin wire. 22 is a hot airchamber through w 'ch passes the upper run of the making-wire carryingthe material being treated, the inlets for the hot air being illustratedat'23 and the, outlet at 24.

17, as described, is a roll which takes theand a machine that willhandle effie upper run of place of the customary suction roll, but inthis case is'a blowing roll. That is to say, air is blown through theopenings in the .roll instead of being drawn in through those openingsand through the material. 25 is a carrying cloth or wire turning aboutpulleys 26 and 27 and having a customary guiding and tensioning roller28 and a guide roller 29 which directs the material now dried betweenthe cutters 30, comprising two opposed outting wheels carried by theframe 31. 32 represents a table upon whichsections of dried sheets areplaced as they come from the cutter. 34 is the customary pump for thereturn water.

In using this apparatus the stock flows on to the making-wire from thehead box, he

ing held back by the customary slice not shown to enable the water tolargely leave the stock and permitting the material to flow on to themaking-wire in as thick a sheet as desired, this being regulated by thedeckle or rubber strap holding the pulp in place on the wire.

As the pulp passes along on'the upper run of the making-wire theremaining water is drawn out by the suction boxes, leaving the materialstill damp.

I The cellucotton must not. be pressed and it will be observed that Ihave dispensed with all pressure and couch rollers. It is necessary thatthe material be kept very porous. The making-wire or the wire-clothcarrying the partly dried substance now passes through the hot airchamber 22' where it receives blasts of hot air, the air" passingthrough the sheet from the bottom upward and out of thegtop of thechamber.

This chamber may be of any desired length, suflicicnt to thoroughlydrythe substance.

The sheet now passes over the roll 17.

Instead of having here a suction roller and applying a vacuum I blow airinto and through this roll so as to cause the sheet to be blown off fromthe making-wire or wirecloth to the carrying device 25 to be directed tothe cutter 30 and thence delivered to the table 32. The cellucotton istherefore formed'and carried through the machine without undergoing anypressure andit will be delivered in a porous, spongy condition.

It will be observed also that the stock flows on to the making-Wire fromthe top side of the cylinder mold. Ordinarily cylinder machines pick upthe stock as the cylinder revolves. This permits a certain thickness ofthe pulp to stick to the mold, and in order to make a thick or heavypaper in such case it is necessary to use a number of cylinder molds andto unite the sheets bypressing them together on the last mold. By nomethod of flowing the pulp over the top 0 the cylinder miold andonto themaking-wire, as described, I free the pulp of water and get the desiredthick sheet suitable for all grades of paper and especially for such aproduction as cellucotton.

1. In a pulp drier, the combination of a flow box, a head box, acylinder mold in the head box,'means for flowing the stock over thecylinder mold --.and Fourdrinier c0nnections receiving the stock.

2. In a ulp drier, the combination of a making roll and associateddevices for carrying the'stock, of a blowing roll at the finishing endof the making wire, and a hot air receptacle surrounding the end of themaking wire.

3. In a pulp drier the combination of a making wire and table rolls, ofa hot air nation of a flow box or chamber inclosing the finishing end ofthe table rolls'and making wire, and means for supplying air to thechamber.

4. A combination Fourdrinier and cylin-' for blowing air through thetreated material I after it is heated to loosen it.

5. In apaper making machine, the combivat, a head box, a cylinder in thehead box, a making wire passing about the cylinder, and means forfeeding and drying the stock Without subjecting it to pressure.

6. In a pulp drier, the combination of a making-wire, a roll over whichpasses the rear. end of the making-Wire, means for blowing air throughthe roll and the materlal, a carrier to receive the material, andcutters lying above the carrier.

In testimony whereof-I afiix my signature.

FRED H. FULLER.

